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Part Number: TPA3116D2
Could you please suggest the bridge IC for converting the Class-D amplifier output to the line output ?I am considering attenuating the output signal of the TPA3116D2 using the potentiometer, the operational amplifiers and outputting the attenuated signal to the line out output.For the line driver DRV632 is reasonable, but the operational amplifiers that can attenuate the audio signal to approximately from -26 dB to 0 dB with the potentiometer are necessary.So, could you please review the attached TINA-TI schematic which is designed based on the following application note ?
TPA3116D2EVM Evaluation Modulehttp://www.ti.com/lit/ug/slou336b/slou336b.pdf
TIPD118 Verified Design Reference Guidehttp://www.ti.com/lit/ug/slau518/slau518.pdf
DRV632EVM Evaluation Modulehttp://www.ti.com/lit/ug/slou301/slou301.pdf
In reply to Sadanori Kato:
Yes, you are correct, postive and negtive supplies are required for pop-free line drive if use one piece TPA1611. Below is a circuit using postive power, but there is pop when use it.
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In reply to Dylan Yao:
Thank you for your support.
Considering the output offset voltage of TPA3116D2, I think that the dc blocking capacitor is necessary.In addition, is there a need for 200 kΩ load resistors proposed by Xiaolin-san ?
Could you please give me your advice ?
Thank you for your quick response.
I added the dc blocking capacitors to the suggested schematic(4062.TPA3116D2_OPA1611_DRV632_Modified1.TSC), but it seems that TL431 cannot drive the blocking capacitor.Then, I changed that to the reference voltage which is obtained by dividing a supply voltage(AVDD) with the resistors.So, could you please double-check the updated schematic "4062.TPA3116D2_OPA1611_DRV632_Modified2.TSC" just in case ?
By the way, I am considering using DRV632EVM as the line driver.
I updated to drive the reference voltage with OPA1611, so could you please double-check the updated schematic "4062.TPA3116D2_OPA1611_DRV632_Modified3.TSC" just in case ?
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